condition mean min max ZT0-3 18.75 18.75 18.75 ZT4-7 7.8 7.8 7.8 ZT8-11 68.45 68.45 68.45 ZT12-15 53.85 53.85 53.85 ZT16-19 55.85 55.85 55.85 ZT20-23 9.45 9.45 9.45